Welcome!
It sounds like you have experienced the dreaded 'angry bees' sound. At least that's what folks are calling it but think it is way worse than that and it really bothers me- I'd liken it to the enraged bear that got his head stuck in the angry bees' hive sound. It's terrible and is the only thing making me not 100% in love with my Clarity. I am not sure I would have bought it if I knew about the bees, I mean bear. That said, I am learning to not hate it as my son reminded me that it is the sound of clean air since it means the car is trying hard to be efficient and clean. The car is trying a little too hard, I think, but ya gotta love kids.
When the car has charge and is in EV mode, I LOVE IT. Thankfully most of my driving is in EV- I charge at home for ~12 hours overnight on my GFCI outlet with the cord that came with the car. Then in the morning I drive 40 miles to work on EV, I charge at work for 2.5-3 hours, via a Level 2, and get home on EV as well, often with range to spare. My commute is 21 miles on back roads going ~40 mph with only a few stop signs and 19 miles on the highway going about 73 mph. Other than at night in winter (I am in NH) with heat and lights on, I can do it all EV. And one warm day I had 26.5 miles left on charge when I got home after driving 39.9 miles in EV only! So yeah, on EV , I LOVE IT! That 26.5 is the record, though I have returned home from work with 15+ miles quite a few times in the warmer weather. I do drive very conservatively except for an occasional quick start off the stop line just because it's fun.
However the trouble is on those instances where I travel further than the available range. I really don't like when the revving starts. Sometimes, when driving on back roads with battery depleted which is when the revving typically happens, even after taking my foot off the gas, the engine continues to rev for a few seconds and I can see it is in the green charging. That is very unnerving to me; it is almost as if the car has a mind of its own with regard to the gas pedal. Not a comfortable feeling. As others have said, I try not to fully deplete the battery since this makes the revving happen.
However on the highway I don't notice the revving engine sound so much, even if the battery is depleted.
I wish it had a way to simply run on gas when there is no battery left, rather than trying to run the car and also charge the battery from burning gas. I thought HVCharge was for simultaneously running the car and charging the battery but it sure does it in regular HV mode as well. By the way, I NEVER use HV Charge--talk about angry bees/bear! That engine sound is so atrocious, and it happens even on the highway, that I fear the car will explode.
So from my experience I'd say if you can run mainly on EV or on the highway, the engine revving sound will not occur much, if at all, and you'll LOVE the car. If you will frequently exceed range and travel more on non-highway roads, unfortunately I'd not advise buying the Clarity if you found the revving to be unnerving. And if you're driving habits leave you somewhere in the middle of those scenarios, at least you know what you'll be getting yourself into as you've experienced the angry bees firsthand already. I think you'll find additional threads if you search angry bees here.
Perhaps you could ask for a weekend trial test drive so you can run it through all possible scenarios; even if you have to pay for it, it'd probably be worth it. I've heard of people getting to do that whereas I test drove for about 10 minutes.
I am not sure if the VOLT does the revving thing when out of charge but, if not, I might consider that. My coworker loves his. But I gotta say, looking at the two cars parked in the lot next to each other, the Clarity is bigger and way nicer (hive and all).
As for the light colored interior- I went with black Touring but they did offer some type of stain resistant treatment at purchase which I declined (even after they dropped the price from like $450 to like $250). It guaranteed against stains and tears and I asked specifically about the 'suede' parts and they said yes it was included so if you love that color, maybe splurge for the treatment for peace of mind but get the price down first or ask them to throw it in.
Oh and I'd also go with the Touring- mainly for the preconditioning option which I don't think is included with standard version, since it is very convenient, at least in the cold NH winter.
Good luck with your decision!